libsodium: don't update config.sub, congig.guess from git.savannah.gn…

[DeckerSU]

…u.org

As of August 30, 2024, git.savannah.gnu.org returned a 502 error when trying to download config.guess and config.sub. For example, attempting to download this link returned a 502 error. As a result, all scripts, workflows, etc., that relied on getting fresh versions of config.{sub,guess} from git.savannah.gnu.org are failing. To prevent this, we disabled updating to the fresh versions of these scripts.